How to save and recover the status of a workflow?

Suppose you have a Workflow object defined with the following code:

julia> using SimpleWorkflows.Thunks: ThunkERROR: UndefVarError: `Thunks` not defined
julia> using SimpleWorkflows: Job, Workflow, run!, →ERROR: UndefVarError: `Job` not defined
julia> function f₁()
          println("Start job `i`!")
          sleep(5)
       endf₁ (generic function with 1 method)
julia> function f₂(n)
          println("Start job `j`!")
          sleep(n)
          exp(2)
       endf₂ (generic function with 1 method)
julia> function f₃(n)
          println("Start job `k`!")
          sleep(n)
       endf₃ (generic function with 1 method)
julia> function f₄()
          println("Start job `l`!")
          run(`sleep 3`)
       endf₄ (generic function with 1 method)
julia> function f₅(n, x)
          println("Start job `m`!")
          sleep(n)
          sin(x)
       endf₅ (generic function with 1 method)
julia> function f₆(n; x = 1)
          println("Start job `n`!")
          sleep(n)
          cos(x)
          run(`pwd` & `ls`)
       endf₆ (generic function with 1 method)
julia> i = Job(Thunk(f₁, ()); user = "me", desc = "i")ERROR: UndefVarError: `Thunk` not defined
julia> j = Job(Thunk(f₂, 3); user = "he", desc = "j")ERROR: UndefVarError: `Thunk` not defined
julia> k = Job(Thunk(f₃, 6); desc = "k")ERROR: UndefVarError: `Thunk` not defined
julia> l = Job(Thunk(f₄, ()); desc = "l", user = "me")ERROR: UndefVarError: `Thunk` not defined
julia> m = Job(Thunk(f₅, 3, 1); desc = "m")ERROR: UndefVarError: `Thunk` not defined
julia> n = Job(Thunk(f₆, 1; x = 3); user = "she", desc = "n")ERROR: UndefVarError: `Thunk` not defined
julia> i → lERROR: UndefVarError: `→` not defined
julia> j → k → m → nERROR: UndefVarError: `j` not defined
julia> j → lERROR: UndefVarError: `→` not defined
julia> k → nERROR: UndefVarError: `→` not defined
julia> wf = Workflow(k)ERROR: UndefVarError: `Workflow` not defined

To save the Workflow instance to disk while running in case it failed or is interrupted, use the serialize function.

julia> using Serialization: serialize
julia> wf = serialize("wf.jls", wf)ERROR: UndefVarError: `wf` not defined
julia> run!(wf)ERROR: UndefVarError: `run!` not defined

After the above steps are finished, a saved.jls file is saved to your local file system. Then you can close the current Julia session and restart it (which resembles an interrupted remote session, for example). To reload the workflow, run:

julia> using SimpleWorkflows

julia> using Serialization: deserialize

julia> deserialize("wf.jls")

And voilà!